Ok First I want to say just how impressed I am with your 3 D printing skills and modelling especially the tire moulds you have made.

I think you are going to struggle with the feeds and speed because there is no way of knowing what the speed of the router is doing because it is only graduated 1-6 on the wheel. So it is going to have to be done by trial and error.

Also I don't think you will be able to cut with anything above about a 4mm cutter as I don't think the machine is rigid enough. That's the trouble with a machine that is made trying to do all things.